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Date: Sat, 25 May 2019 10:48:08 +0200 From: Ingo Molnar <mingo@...nel.org> To: kan.liang@...ux.intel.com Cc: vincent.weaver@...ne.edu, ak@...ux.intel.com, peterz@...radead.org, alexander.shishkin@...ux.intel.com, acme@...hat.com, jolsa@...hat.com, eranian@...gle.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] perf/x86: Disable non generic regs for software/probe events * kan.liang@...ux.intel.com <kan.liang@...ux.intel.com> wrote: > @@ -57,6 +57,11 @@ static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = { > #endif > }; > > +u64 non_generic_regs_mask(void) > +{ > + return (~((1ULL << PERF_REG_X86_XMM0) - 1)); > +} > + > u64 perf_reg_value(struct pt_regs *regs, int idx) > { > struct x86_perf_regs *perf_regs; > diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h > index 4767474..c1c3454 100644 > --- a/include/linux/perf_regs.h > +++ b/include/linux/perf_regs.h > @@ -9,6 +9,8 @@ struct perf_regs { > struct pt_regs *regs; > }; > > +u64 non_generic_regs_mask(void); This is a *constant* value, why is it in a separate function, not an inline? Or rather, since it's obviously a constant, name it in such a way. (PERF_REG_X86_NON_GENERIC_MASK or so.) To the generic code define it as 0 if arch headers haven't overriden it. > +u64 __weak non_generic_regs_mask(void) > +{ > + return 0; > +} > + > +static inline bool has_non_generic_regs(struct perf_event *event) > +{ > + u64 mask = non_generic_regs_mask(); > + > + return ((event->attr.sample_regs_user & mask) || > + (event->attr.sample_regs_intr & mask)); 'return' is not a function ... > + /* only support generic regs */ > + if (has_non_generic_regs(event)) > + return -EOPNOTSUPP; In human readable comments please use complete sentences with no unnecessary abbreviations, i.e. "Only support generic registers". Thanks, Ingo
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